Influence of gamma ray irradiation on stoichiometry of hydrothermally synthesized bismuth telluride nanoparticles

Abishek, N.S.; Naik, K. Gopalakrishna

doi:10.1063/1.5032402

Cited by 2 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the Te spectrum demonstrates a strong Raman peak at about 118/120 cm −1 wavenumber. It should be noted that the spectra of few monolayer Bi 2 Te 3 show lines at ~ 93 cm −1 and 114 cm −1 , and they may be attributed to the Se and S doping, as previously mentioned [50,52,54,55]. Furthermore, samples with S=0.00 and S=0.06 clearly exhibit a lower shoulder (≈115 cm −1 ) in the A 1 u mode (due to excess of Te as compared to Bi 2 Te 3 ) leading to A 1 u peak broadening.…”

Section: Raman Spectroscopysupporting

confidence: 63%

“…This mode was identified as an A 1 u mode (X peak) observed in nano-crystalline and few-quintuple thick Bi 2 Te 3 [53]. It is significant that the A 1 u mode originated as an active phonon mode in the infrared (IR) is forbidden in Raman for centrosymmetric Bi 2 Te 3 [50,54,55], where the existence of Te1 atoms in the center of Bi 2 Te 3 unit cell makes the IR active modes (A 1 u ) to be odd parity. As the polarizability of odd parity modes does not change, they are often inactive modes for Raman, especially in centro-symmetric molecules [53].…”

Section: Raman Spectroscopymentioning

confidence: 98%

See 1 more Smart Citation

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Shalaby

Hashem

Yousif

et al. 2020

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

In the present work, a systematic preparation of Bi 2 Te 2.85 Se 0.15-x S x (x=0.0, 0.02, 0.04 and 0.06) compositions were carried out by solvothermal method. The materials were characterized by XRD, SEM, EDX, TEM and Raman spectroscopy.XRD, as well as TEM, to confirm the nanostructure of samples. The electrical and thermal properties were investigated in the temperature range from room temperature to 600 K. The highest power factor was 1.3 x 10 -2 mW/ K 2 m at 600 K for (x=0.06) sample. This improvement in the thermoelectric properties may be due to the ordered atomic arrangement of Bi, Te, and Se induced by sulphur in the Bi 2 Te 2.85 Se 0.15-x S x nano-composites, which was confirmed by X-ray diffraction (XRD) and Raman spectral analysis. The optical properties, such as energy gap, refractive index, extinction coefficient and dielectric constants, were obtained from the diffused reflectance data in the range of 200 to 800 nm. Sulphur doping influences the optical energy gap, reaching the lowest value for x=0.04 samples (0.14 eV), while the highest allowed energy gap was found in x=0.06 ones (0.41eV).

show abstract

Section: Raman Spectroscopysupporting

confidence: 63%

Section: Raman Spectroscopymentioning

confidence: 98%

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Shalaby

Hashem

Yousif

et al. 2020

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…Many scientists have attempted to produce and characterize Bi 2 Te 3 /PANI composites. [26][27][28][29] Li and his colleagues successfully synthesized Bi 2 Te 3 -PANI utilizing the mechanical blending approach; they discovered that the composite's power factor is lower than both individual compartments. 28 The physical synthesis of Bi 2 Te 3 and PANI hybrid, on the other hand, required mixing and solution mixing.…”

Section: Introductionmentioning

confidence: 99%

“…27 PANI and Bi 2 Te 3 have been explored structurally and electrically by several researchers. 20,29,30 This research's main originality is highlighting the engineering of new materials with remarkable structural, thermal, and magnetic properties. Additionally, the coupling between PANI and Bi 2 Te 3 after being irradiated with gamma rays which increases cross-linking, and evaluating the physical and chemical properties of PANI/ Bi 2 Te 3 compounds for standing on their new applicability for magnetic and thermistor in the future.…”

Section: Introductionmentioning

confidence: 99%

γ‐irradiation hardness investigations of (PANI)_1−x(Bi₂Te₃)_x composites for thermistor applications

Shalaby

Abdelhaleem

Taha

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

The (PANI) 1Àx (Bi 2 Te 3 ) x composites were successfully synthesized. These composites have a simple physical combination of intrinsic conducting polymer and nanocrystal topological insulator materials which are promising new materials for unusual applications. The influence of γ-irradiation (100 kGy doses) on the performance of the (PANI) 1Àx (Bi 2 Te 3 ) x composites was described by atypical techniques to assess the radiation hardness of the samples. X-ray diffraction and Raman spectroscopy measurements show the semi-crystalline phases, the other structural parameters, and the phonon modes. The compositional analysis and the morphological properties were investigated by energy-dispersive X-ray, while transmission electron microscopy imaging confirmed the morphology of the dopants of Bi 2 Te 3 nanoparticles into the polyaniline (PANI) matrix, which shows the accumulation of the particles. Thermogravimetric analysis figured out the degradation behavior of the compositions. The representative electron spin resonance (ESR) signal exhibits a narrow single-line ESR spectrum for PANI/Bi 2 Te 3 nanoparticle concentrations. (PANI) 1Àx (Bi 2 Te 3 ) x illustrates unexpected ferromagnetic behavior that confirms the magnetic performance of the samples without introducing any magnetic dopants. The obtained materials showed promising performance for using such hybrid materials as a positive temperature coefficient thermistor.

show abstract

Influence of gamma ray irradiation on stoichiometry of hydrothermally synthesized bismuth telluride nanoparticles

Cited by 2 publications

References 12 publications

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

γ‐irradiation hardness investigations of (PANI)_1−x(Bi₂Te₃)_x composites for thermistor applications

Contact Info

Product

Resources

About

Influence of gamma ray irradiation on stoichiometry of hydrothermally synthesized bismuth telluride nanoparticles

Cited by 2 publications

References 12 publications

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

Preparation, structural characteristics and optical parameters of the synthesized nano-crystalline sulphur-doped Bi2Te2.85Se0.15 thermoelectric materials

γ‐irradiation hardness investigations of (PANI)1−x(Bi2Te3)x composites for thermistor applications

Contact Info

Product

Resources

About

γ‐irradiation hardness investigations of (PANI)_1−x(Bi₂Te₃)_x composites for thermistor applications